What is your educated guess from earlier events where airlines joined SkyTeam:

If I have Delta flights in November and I do not credit them to any FFP, can I retroactively credit them to the Garudia program in March? (This would be within a six month period.)

And, if there is a chance, should I join GFF before my flights or in March?

With Garudia, as it stands now, I could get silver with 10 segments. That would be most welcome, as it will reduce my luggage fees.